diff --git a/bacnet-stack/demo/epics/Makefile b/bacnet-stack/demo/epics/Makefile
index 853ae6af..fd1741f3 100644
--- a/bacnet-stack/demo/epics/Makefile
+++ b/bacnet-stack/demo/epics/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/gateway/Makefile b/bacnet-stack/demo/gateway/Makefile
index 7a7f38da..eb0e45d1 100644
--- a/bacnet-stack/demo/gateway/Makefile
+++ b/bacnet-stack/demo/gateway/Makefile
@@ -9,7 +9,7 @@ TARGET = bacgateway
 
 TARGET_BIN = ${TARGET}$(TARGET_EXT)
 
-SRCS = main.c 
+SRCS = main.c
 
 OBJS = ${SRCS:.c=.o}
 
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/iamrouter/Makefile b/bacnet-stack/demo/iamrouter/Makefile
index b3c3d05e..a20b6fb2 100644
--- a/bacnet-stack/demo/iamrouter/Makefile
+++ b/bacnet-stack/demo/iamrouter/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/initrouter/Makefile b/bacnet-stack/demo/initrouter/Makefile
index cc0439f7..8bf952ce 100644
--- a/bacnet-stack/demo/initrouter/Makefile
+++ b/bacnet-stack/demo/initrouter/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/readfile/Makefile b/bacnet-stack/demo/readfile/Makefile
index cd272bc3..72d28828 100644
--- a/bacnet-stack/demo/readfile/Makefile
+++ b/bacnet-stack/demo/readfile/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/readpropm/Makefile b/bacnet-stack/demo/readpropm/Makefile
index 0e2f47d4..9b7b955c 100644
--- a/bacnet-stack/demo/readpropm/Makefile
+++ b/bacnet-stack/demo/readpropm/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/reinit/Makefile b/bacnet-stack/demo/reinit/Makefile
index bdcbe2b1..a9609f29 100644
--- a/bacnet-stack/demo/reinit/Makefile
+++ b/bacnet-stack/demo/reinit/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/server/Makefile b/bacnet-stack/demo/server/Makefile
index f32e9a5b..25d60267 100644
--- a/bacnet-stack/demo/server/Makefile
+++ b/bacnet-stack/demo/server/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/timesync/Makefile b/bacnet-stack/demo/timesync/Makefile
index afa3f7a1..ef39a83c 100644
--- a/bacnet-stack/demo/timesync/Makefile
+++ b/bacnet-stack/demo/timesync/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/ucov/Makefile b/bacnet-stack/demo/ucov/Makefile
index 5a5e5ec9..395aec7a 100644
--- a/bacnet-stack/demo/ucov/Makefile
+++ b/bacnet-stack/demo/ucov/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/whohas/Makefile b/bacnet-stack/demo/whohas/Makefile
index bfdae683..51125e75 100644
--- a/bacnet-stack/demo/whohas/Makefile
+++ b/bacnet-stack/demo/whohas/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/whois/Makefile b/bacnet-stack/demo/whois/Makefile
index aa4abd6c..00ef02f2 100644
--- a/bacnet-stack/demo/whois/Makefile
+++ b/bacnet-stack/demo/whois/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/whoisrouter/Makefile b/bacnet-stack/demo/whoisrouter/Makefile
index 7563f2b1..585f238a 100644
--- a/bacnet-stack/demo/whoisrouter/Makefile
+++ b/bacnet-stack/demo/whoisrouter/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/writefile/Makefile b/bacnet-stack/demo/writefile/Makefile
index 707ab3ba..6d212166 100644
--- a/bacnet-stack/demo/writefile/Makefile
+++ b/bacnet-stack/demo/writefile/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/writeprop/Makefile b/bacnet-stack/demo/writeprop/Makefile
index a92db403..2667a8c4 100644
--- a/bacnet-stack/demo/writeprop/Makefile
+++ b/bacnet-stack/demo/writeprop/Makefile
@@ -23,7 +23,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@